Added github actions

Building and linting, in order to maintain code quality over time. This
is a change from TravisCI for experimentation with Github Actions.

.github/workflows/ci.yml

@@ -0,0 +1,33 @@
+name: Go
+
+on: [push, pull_request]
+
+jobs:
+  ci:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up Go 1.x
+        uses: actions/setup-go@v2
+        with:
+          go-version: ^1.14
+        id: go
+
+      - name: Check out code into the Go module directory
+        uses: actions/checkout@v2
+
+      - name: Get dependencies
+        run: |
+          go get -v -t -d ./...
+      - name: Build
+        run: go build -v .
+
+      - name: Install Richgo
+        run: go install github.com/kyoh86/richgo
+
+      - name: Test
+        run: richgo test -v -coverprofile=profile.cov ./...
+
+      - name: Send coverage
+        uses: shogo82148/actions-goveralls@v1
+        with:
+          path-to-profile: profile.cov

.github/workflows/lint.yml

@@ -0,0 +1,11 @@
+name: lint
+on: [pull_request]
+jobs:
+  golangci-lint:
+    name: runner / golangci-lint
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code into the Go module directory
+        uses: actions/checkout@v2
+      - name: golangci-lint
+        uses: reviewdog/action-golangci-lint@v1